Boiler



Aug. 12, 192.4. 1,504,924

R. ANDERSON BOILER Filed April 29. 1921 2; Sheets-Sheet 1 WITNESSES //VVE/VTOR fivf EOBEETANDEESQN B Y l A TTOR/VEYS Aug. 12 1924.

R. ANDERSON BOILER Filed April 29. 1921 3 Sheets-Sheet l/Vl/E/VTUR Posse nan/0525 ON ATTORIVHS Aug. 12, 1924.

R. ANDERSON BOILER Filed Abril 29. 1921 Sheets-Sheet 5 W/f/VESSES A TTORNE Patented Aug. 12, 1924.

UNITED STATES mm F ROBERT ANDERSON, or, BROOKS, ALB RTA, CANADA, Ass'IG'uon or ONE-HALF 'ro .rn'rnn MAGGR-EGQB, or DETROIT, MIQHIGAN.

Application filed April as,

T all whom it may concern: v a

Be it known that 1, ROBERT ANDERSON, a citizen of the Dominion of Canada, anda resident of Brooks, in the Province of Alberta and Dominion ef Canada, have invented a new and Improved Boiler, of which the following is a description. s

The general object of my invention is-to provide an eiiicient' boiler fer steamer hot water heating and: constructed of few and simple parts so arranged as to facilitatethe assemblage, or the disassemblage in order to effect repairs or renewal of parts I 3 The invention alsounake fprovisionfor a thorough cleaning, of verti cal tubes employed, and embodies other distinctive features as willclearly appear. 1

, Referenceisto be had to the accempanying drawings forming part of this specification,it being understood that the drawings are merely illustrative of one example of the invention. a v i a Figure 1 is ayertical section of a boiler embodying my invention; k v

Figure 2 is a horizontal section on the l1ne. 22,Figure1; v

Figure 3 is a horizontal section on the l1ne 3-:3,Figure1;, v. .7 v t.

Figure 4 is a horizontal section on the line. 4E-4, Figure 1; I

Figure 5 is a horizontal section on the l1ne 55, Figure 1;

Figure 6 is a horizontal sectlon on the l1ne 66, Figure 1;

Figure 7 is a plan View of-the scraper,

Figure 8 is a horizontal section on the l1ne 8 -8, Figure 1;

Figure 9 is a plan view of the grate.

In carrying out my invention 1n accordance with the illustrated example I provlde supporting means in the form of legs 10 employed in suitable number about the boiler, one of the legs being shown in Figure 1. On and between the legs 10 are supported double doors 11 hinged to the legs as at 11*, the doors of a pair overlapplng as at 11 one of the doors of each pair having a handle 11. The doors 11 enclose the fire chamber and ashpit. Within the ashpit is a grate structure 12 open at the center and here shown as formed in three sections. Over the open center of the grate is a conical cap-15 to deflect-the fuel falling thereon laterally outward onto an annular grate cleaner 14 superposed on the grate sec- 1921. I steal as. 465,381.

tions 12,7 and formed with a socket 14?, to receiye a shaker, The cleaner may as shown be formed in half sectionspverlapping at their adjacent edges as indicated at 1 1? in Figure 8. The-grate sections have support in the illustrated form on aplurality of legslt}, heresshown as, 3 in number. The grate structure 12 has an annular rim flange 12; and an inner annular flange 12, said flanges beingformed in arcuate sections on the respectivegrate sections. The legs 10 carry at their upperends a ring 16 on which is 5 an upstanding annular flange 17 within which is received the outer boiler shell 18. On the legs 10 also, at the inner sides, at the top, are flanges 19 directed laterally inward, theinneredges19? of said flanges being depressed in curved form and serving to receiveand support a lower annular water header 20. V

Aninner shell 21 is providedwith external lugs 22 restingon lugs of header 20. Below and suspended from the header 2O is an annular mud drum 23 having a plurality of pipes 24: connected therewith, two of said pipes serving in practice as water inlets and the third tobe employed as a blow-off. The drum 23 is connected with and suspended from the header 20 by short stay tubes 25 threaded at their ends respectively into the drum and header and pro vided with upper and lower packing nuts 26, 26 the lower nut bearing against the upper ground face of the drum and the upper nut bearing against the internally threaded nipples 27 on the header.

Vertical tubes rise from the header 20 and they are disposed in groups, there being in each group an outer pair of tubes 28 and an inner tube 28" in staggered relation to the outer tubes, while between the tubes 28, 28 isa tube 29. The upper ends of each group of tubes 28, 28 29 are connected with one of a plurality of water chambers or individual headers 30. The central tubes 29 are threaded into the lower header 20 and into water chambers 30 and upper and lower packing nuts 31, 31 are provided on the threaded portions of said tubes. The tubes 28, 28 are clamped in position between the header 20 and the water chambers 30 through the medium of the tubes 29 so that by turning back the nuts 31, 31" the tubes 29 may be taken out and/this will re lease the tubes 28, 28

Above the annular series of water cha'mbers is an annular steam chamber 32 connected with said chambers 30 by short stay pipes 33 having upper and lower pack 'ing nuts 34, 34, said pipes being threaded into the steam chamber and water chambers respectively. Lateral pipes 35, 35 lead from the steam chamber 32 and one of the chambers 30 for connection with a level gage (not shown). Vertical discharge pipes 36 lead from the steam chamber 32 and it will .be understood that when the boiler is used in a hot-water heating system the annular chamber- 32 will contain water instead of v space and circulate about the tubes 28, 28

29. A smoke pipe 38 rises from the cap 37. I In order to scrape the tubes 28, 28% 29 effectively and with facility, I provide an annular scraper 39 in the space between the shells through which scraper the tubes extend so that the scraper may slide vertically thereon. The scraper is composed preferably of upper and lower plates perforated for the water tubes and an intermediate plate 39. Rods 40 rise vertically from "the scrapers and extend through the cap 37, the upper ends of the rods being connected with wires 41 to extend to any suitable point for the convenient raising and lowering of the scraper to remove any' deposit from the exterior of the tubes.

I would add that one door 11 of each pair is offset at the free edge and the offset portion is overlapped at the inner side by the other door of the pair. One of the handles 11 is provided on that door of each pair having the offset edge, and the laterally directed inner end 11 of the handle overlaps the other door of the pair, whereby the handle serves as a latch for the pair of doors.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the exact details herein illustrated, since manifestly the same can be considerably varied. without departure from the spirit of the invention as defined in the appended claim.

Having thus described my invention, I claim:

A boiler of the class described, including a ring, means supporting said ring, series of doors on said supporting means and enclosing the fire chamber and ash pit of the boiler, an outer shell supported on said ring, an annular lower header supported on said supporting means, and having a water inlet, an annular mud drum suspended by stay pipes from said header and communicating therewith, an inner shell supported on said header, vertical tubes rising from said header between the shells, separate chambers with which separate groups of said vertical tubes communicate at their upper ends, certain of the tubes being threaded into the lower header and into said chambers, others of each group being held clamped between the chambers and lower header through the medium of the threaded tubes, and an annular chamber above and in communication with said separate chambers.

ROBERT ANDERSON. 

